Abstract: A dual-beam torque wrench with a linear display and a linear locking member is provided. The torque wrench includes a head that couples to a socket to rotate a fastener or bolt. A housing of torque wrench extends from the head to form a handle. Within the housing forming the handle are two beams: a lever beam that transmits the force from the handle to the head and a deflecting beam that couples to the head and not the handle. The deflecting beam deflects away from the lever beam to indicate that a predetermined torque has been applied. A torque adjustment assembly moves the lever beam relative to the head to set the predetermined torque, and a pin follows the linear display to indicate to the user the set predetermined torque.

Abstract: A ratchet tool provided, including: a driver body, including a handle and a working rod connected with the handle, at least one of the handle and the working rod being integrally formed with a first blocking structure; at least one sleeve member, being disposed around and unidirectionally rotatable about the driver body, integrally formed with a second blocking structure, at least one of the first and second blocking structures being configured as a ratcheting structure, the second blocking structure being releasably stuck with the first blocking structure in a rotation direction; wherein when there is a relative torque greater than a predetermined torque between the at least one sleeve member and the driver body, at least one of the first blocking structure and second the blocking structures deforms and the second blocking structure is slidable over the first blocking structure in the rotation direction.

Abstract: An impact bit holder may include a drive body having a drive end configured to interface with a powered driver, a driven body having a driven end configured to interface with a bit, and an elastic torque transfer assembly configured to operably couple the drive body to the driven body. The drive body and the driven body share a common axis under a no load condition. The elastic torque transfer assembly may include a coupling protrusion and a coupling channel disposed at a coupling axis offset from the common axis such that the coupling protrusion extends into the coupling channel to operably couple the drive body to the driven body.

Abstract: A torque wrench for multiple bolts or nuts comprises multiple drive spindles that are arranged annularly around a center and are equipped or able to be equipped at the end with respective torque-applying tools, and a ratchet drive, associated with each drive spindle and driven by means of a hydraulic piston drive, for driving the drive spindles. The torque wrench for multiple bolts or nuts also comprises an actuator unit for inducing a rotary movement in the drive spindles, having an actuating wheel mounted rotatably about the axis of the center of the annular arrangement of the drive spindles as drive wheel, which drives respective output wheels fitted on the drive spindles, wherein the driving movement of the actuating wheel is transmitted to the drive spindle via respective torque limiters.

Abstract: A torque wrench including a head, a handle, a primary beam, a secondary beam, and a torque adjustment mechanism. The primary beam couples the head and the handle for co-rotation about the rotational axis and the primary beam includes a first end adjacent the head and a second end adjacent the handle. The secondary beam is coupled to the head for rotation with the head about the rotational axis and the secondary beam is movable relative to the primary beam and the handle. The torque adjustment mechanism adjusts a torque setting of the primary beam relative to the secondary beam. The torque adjustment mechanism includes a thumb adjustment wheel that a user rotates about a first axis to adjust the torque setting by moving the second end of the primary beam relative to the handle along a second axis offset from the first axis.

Abstract: An apparatus to limit a seating depth of a fastener can include a cylindrical housing, a pin, a driver, and a biasing element. The cylindrical housing can include a proximal portion couplable to a tool, a distal portion engageable with a workpiece, and a bore extending from an opening on the distal portion towards the proximal portion along a longitudinal axis of the housing. The pin can be secured to the housing and can extend radially inward into the bore. The driver can be translatable within the bore of the housing and can extend beyond the opening on the distal portion to engage the fastener. The driver can include a slot that can be engageable with the pin to receive a torque from the pin and can rotate with the housing to transfer the torque to a fastener when the pin engages the slot.

Abstract: A tool with a drive lug having groove formed on the drive lug to promote failure of the drive lug before internal component failure. The groove has a predetermined diameter and is formed on the drive lug or ratchet square to cause failure of the drive lug, due to a torsional ductile fracture, before any internal component failure of the tool, such as, for example, gear and/or pawl failure in a ratchet wrench.

Abstract: A torque wrench has a hollow tubular body. A long rod and a short rod are provided in the hollow tubular body. The hollow tubular body is formed with a first through hole and a second through hole respectively corresponding to the long rod and the short rod. A first limiting unit is provided in the first through hole, and a second limiting unit is provided in the second through hole. The first limiting unit enables to slide into a first gap spaced apart between the long rod and the hollow tubular body to limit the swing range of the long rod, and the second limiting unit enables to slide into a second gap spaced apart between the short rod and the hollow tubular body to limit the swing range of the short rod, thereby improving the accuracy of the tripping torque and making the torque wrench easy to calibrate.

Abstract: A quick-release tool connection rod is provided, including a main member, a sleeve and at least one locking mechanism. The sleeve is movably on the main member. The at least one locking mechanism includes a skew guide face, an elongate hole and a locking ball, the skew guide face is disposed on the sleeve, the elongate hole is disposed on the main member, and the locking ball is disposed in the elongate hole.

Abstract: A dual-beam torque wrench with a linear display and a linear locking member is provided. The torque wrench includes a head that couples to a socket to rotate a fastener or bolt. A housing of torque wrench extends from the head to form a handle. Within the housing forming the handle are two beams: a lever beam that transmits the force from the handle to the head and a deflecting beam that couples to the head and not the handle. The deflecting beam deflects away from the lever beam to indicate that a predetermined torque has been applied. A torque adjustment assembly moves the lever beam relative to the head to set the predetermined torque, and a pin follows the linear display to indicate to the user the set predetermined torque.

Abstract: A torque wrench includes a main body, a driving portion, a torque-disengageable mechanism, a torque assembly and an adjusting assembly. The main body defines an axial direction and includes a handle and a tubular member which are assembled with each other. The handle has an opening which is open radially. The torque-disengageable mechanism is swingably disposed within the tubular member. The torque assembly is disposed in the main body. The adjusting assembly includes a position-limiting member, a slidable assembly and an adjusting member. The adjusting member is rotatably connected to the handle and corresponding to the opening. The adjusting member has a first threaded portion. The slidable assembly has a second threaded portion screwed with the first threaded portion.

Abstract: A selectively adjustable torque indicating tool is provided for rotating a mechanical fastener to a predetermined torque setting. The tool includes a pair of supports and a tool bit positioned between the pair of supports and engageable with a mechanical fastener such that when the tool bit, a rotational force is imparted on the mechanical fastener. A spring is coupled to the pair of supports, and operatively coupled to the tool bit. The spring includes a first end portion movable relative to the pair of supports between a neutral position and a torqued position in response to the rotational force being imparted on the mechanical fastener by the tool bit. An adjuster is coupled to the spring to adjust a stiffness of the spring such that movement of the first end portion of the spring from the neutral position to the torqued position corresponds to a predefined rotational force.

Abstract: An insertion instrument is configured to attach and secure to an expandable implant. The insertion instrument includes a securement member that is configured to be secured to the implant both when the implant is in a collapsed configuration and when the implant is in an expanded configuration. The insertion instrument further includes a drive member that is configured to actuate the implant to the expanded configuration.

Abstract: A torque wrench including a head, a handle, a primary beam, a secondary beam, and a torque adjustment mechanism. The primary beam couples the head and the handle for co-rotation about the rotational axis and the primary beam includes a first end adjacent the head and a second end adjacent the handle. The secondary beam is coupled to the head for rotation with the head about the rotational axis and the secondary beam is movable relative to the primary beam and the handle. The torque adjustment mechanism adjusts a torque setting of the primary beam relative to the secondary beam. The torque adjustment mechanism includes a thumb adjustment wheel that a user rotates about a first axis to adjust the torque setting by moving the second end of the primary beam relative to the handle along a second axis offset from the first axis.

Abstract: A cable connector wrench and method of operation that in one example has a shaft with a pair of asymmetrical jaws at one end and a handle coupled to the other end. The two jaws form an assembly in which the jaws are joined with a pivot. The fixed jaw is attachable to the shaft and the movable jaw is coupled to the fixed jaw. The movable jaw and the fixed jaw cooperate to engage a connector of a cabled assembly wherein the connector wrench is adapted for tightening or loosening the connector of the cabled assembly.

Abstract: A torque wrench including a head, a handle, a primary beam, a secondary beam, and a torque adjustment mechanism. The primary beam couples the head and the handle for co-rotation about the rotational axis and the primary beam includes a first end adjacent the head and a second end adjacent the handle. The secondary beam is coupled to the head for rotation with the head about the rotational axis and the secondary beam is movable relative to the primary beam and the handle. The torque adjustment mechanism adjusts a torque setting of the primary beam relative to the secondary beam. The torque adjustment mechanism includes a thumb adjustment wheel that a user rotates about a first axis to adjust the torque setting by moving the second end of the primary beam relative to the handle along a second axis offset from the first axis.

Abstract: A torque limiting instrument is disclosed configured to drive a shaft to rotate in a select direction in response to an applied torque until the applied torque reaches a predetermined threshold. Thus, when the torque limiting instrument drives a bone screw into bone, the bone screw is advanced into the bone until the torque applied to the torque limiting instrument reaches the predetermined threshold, at which point the torque limiting instrument will no longer communicate the applied torque to the bone screw.

Abstract: An exoskeleton for a limb of a user wherein the limb has an upper portion that is pivotally mounted to another part of the exoskeleton about a pivot axis and the upper portion is drivingly connected to the exoskeleton by a force applied via a drive force transmission axis that is vertically offset from the pivot axis.

Abstract: An exoskeleton for a limb of a user wherein the limb has an upper portion connected to the body of a user and a lower limb portion is provided. The exoskeleton comprises a drive force transmission mechanism drivingly connecting a drive motor having an output axle aligned with the upper limb portion to one of the body portion and the lower limb portion. The drive force transmission mechanism comprises a first gear provided on an upper end of the lower limb portion or on the body portion and a first transfer member extending transverse to the motor axis.

Abstract: Described herein are devices and methods for limiting the torque applied to surgical screw during a surgical procedure in which a surgical screw is passed into a vertebra, such as, for example, a spinal fusion procedure. A surgical screw driver is configured to prevent an excessive amount of torque from being delivered to the vertebrae through a surgical screw. When an excessive amount of torque is delivered to the handle of a surgical screw driver, it is prevented from being transmitted to the surgical screw and is thus not delivered to the vertebrae. Excessive force in the form of excessive torque transmitted to a vertebrae may cause a fracture along with possible mispositioning or displacement of a surgical screw.

Abstract: Wrench (1) for providing a maximum torque to an external part, characterized in that it comprises at least one elongated metal part (3) provided with a fixed end (4) and a pusher end (5), and which also comprises a torque-applying head (6) upon which the pusher end (5) acts, wherein the elongated metal part (3) is capable of bending when a torque is applied with the wrench, and wherein the elongated metal part (3) reaches a maximum bending point that determines the maximum torque provided by the wrench (1). The inventive wrench (1) is easier to use than conventional spring-based wrenches as the force required to adjust the torque is minimal and independent of the torque value to which the wrench is adjusted. It is also capable of providing higher torque values.

Abstract: A socket for an impact tool includes an input recess configured to receive an anvil of the impact tool and an output recess configured to receive a head of a fastener.

Abstract: A socket for an impact tool includes an input recess configured to receive an anvil of the impact tool and an output recess configured to receive a head of a fastener.

Abstract: In a pretensioner mechanism, movement of a piston is anchored by an anchoring pin. The anchoring pin is crushed and the piston is allowed to move. Hence, a pinion is turned by a rack of the piston. A facilitating cavity is formed in the anchoring pin. Crushing and deformation of the anchoring pin in a diametric direction thereof due to a movement of the rack is facilitated by the facilitating cavity. Therefore, the anchoring pin may be easily crushed and deformed in the diametric direction by the movement of the rack, and the action of the anchoring pin caused by the movement of the rack may be effectively made consistent.

Abstract: A torque wrench includes a mechanical structure and an electronic structure. The mechanical structure includes a tubular body, a flexible rod, an abutment member, an elastic member, a trip mechanism, an adjustment mechanism and a mechanical scale indication mounted in the tubular body for indicating the set torque of the wrench. The electronic structure includes at least one torque sensor and a display unit. When correcting the torque value of the mechanical structure, a force is applied to the wrench and the torque sensor detects the trip torque value of the wrench. The torque value of the mechanical structure is adjusted to match the torque value detected by the torque sensor so as to eliminate the error of the torque value of the mechanical structure.

Abstract: A torque wrench for implantable medical devices is disclosed. The torque wrench comprises a first and a second component. The first component has first and second ends with a bore extending between the first and second ends of the first component. The first component includes a plurality of anti-rotation members extending from an inner surface of the bore at the second end of the first component. A second component includes a middle portion having a first and second ends. A drive shaft extends from the first end and a plurality of fingers extends from an exterior surface of the second end. The second component is received in the bore of the first component such that the fingers are interdigitate with the anti-rotation members.

Abstract: Wrench (1) for providing a maximum torque to an external part, characterised in that it comprises at least one elongated metal part (3) provided with a fixed end (4) and a pusher end (5), and which also comprises a torque-applying head (6) upon which the pusher end (5) acts, wherein the elongated metal part (3) is capable of bending when a torque is applied with the wrench, and wherein the elongated metal part (3) reaches a maximum bending point that determines the maximum torque provided by the wrench (1). The inventive wrench (1) is easier to use than conventional spring-based wrenches as the force required to adjust the torque is minimal and independent of the torque value to which the wrench is adjusted. It is also capable of providing higher torque values.

Abstract: A torque screwdriver contains: a main body; a driving head and a torque mechanism disposed in the main body and the driving head engages with the driving head; a grip bar installed on a top end of the main body and having two ends which are a long end and a short end so that a configuration of the grip bar and the main body is in a T shape; an insertion hole defined in a top face of the grip bar, wherein a center of the insertion hole is located at the central axis of the torque mechanism. Thereby, the torque screwdriver is operated in a narrow space easily. A force rod can be inserted into the insertion hole, and a forcing position of the force rod for driving the torque screwdriver is identical to a center of the torque mechanism, thus acquiring a precise torque value.

Abstract: A tool holder for use with a power tool includes an input shaft with a rear portion couplable to a power tool, and an output shaft with a front portion couplable to a tool bit. A clutch assembly releasably non-rotationally couples a front portion of the input shaft to a rear portion of the output shaft, and includes a recess in the front portion of the input shaft or the rear portion of the output shaft, an aperture in the other of the front portion of the input shaft or the rear portion of the output shaft, a roller received in the aperture, and a spring that biases the roller radially inwardly toward the recess. The spring enables release of the roller radially outwardly from the recess when a predetermined torque threshold is exceeded, such that torque is not transmitted from the input shaft to the output shaft.

Abstract: A torque limiting engine rotation tool for rotating a crankshaft of an engine, where the engine rotation tool is configured to be operated with a socket wrench or non-impacting tool and is configured to engage an accessory drive pulley bolt or any other bolt that causes the crankshaft to rotate, includes a socket body. The socket body has a driving portion coupled to a bolt-torquing portion with a shear pin. A receiving recess is defined by the driving portion and is configured to receive the socket wrench or non-impacting tool. A female socket recess is defined by the bolt-torquing portion and is configured to engage the bolt. The amount of torque applied by the socket wrench or non-impacting tool to the bolt is limited by the shear strength of the shear pin.

Abstract: An ultrasonic clamp coagulator system that is configured to permit selective cutting, coagulation and clamping of tissue during surgical procedures. An elongated portion of the instrument can be configured for endoscopic applications and has an outside diameter of less than 6 mm. The system includes a one-piece torque wrench that is provided with cantilever arms aligned in an annular fashion about the centerline of the torque wrench. The cantilever arms include teeth in an inward perpendicular fashion in relation to cantilever arms. The clamp coagulator includes an outer tube retainer that includes spline gears projecting in a perpendicular fashion along the outer circumference of retainer. Torque is transmitted through the cantilever arms to the spline gears for attaching a handpiece to the clamp coagulator.

Abstract: A tool holder for use with a power tool includes an input shaft with a rear portion couplable to a power tool, and an output shaft with a front portion couplable to a tool bit. A clutch assembly releasably non-rotationally couples a front portion of the input shaft to a rear portion of the output shaft, and includes a recess in the front portion of the input shaft or the rear portion of the output shaft, an aperture in the other of the front portion of the input shaft or the rear portion of the output shaft, a roller received in the aperture, and a spring that biases the roller radially inwardly toward the recess. The spring enables release of the roller radially outwardly from the recess when a predetermined torque threshold is exceeded, such that torque is not transmitted from the input shaft to the output shaft.

Abstract: An L-shaped torsional wrench is provided. The wrench includes a shell body, an elastic member, an L-shaped rod and a handle. A pushing member is assembled in the shell body and is movable between a first position and a second position along the shell body. The elastic member is compressed by the pushing member when the pushing member is located in the first position for compressing the elastic member. The pushing member is noncompressed by the elastic member when the pushing member is located in the second position so that the elastic member recovers from said compression for slowing the fatigue of the elastic member, extending the durability of the elastic member and keeping the torsional accuracy of the wrench.

Abstract: A socket wrench includes a handle having a housing and a grip portion, a drive shank having a ratchet wheel mounted in the housing, two pawl members engaged with the ratchet wheel, a switching member located between the pawl members, two elastic members each biased between the housing and the respective pawl member, a control knob connected with the switching member, a driven arm having a mounting sleeve and an arcuate mounting slot, a connecting plate provided on the handle, and two driving arms provided on the connecting plate and received in the mounting slot. When in use, one of the driving arms drives the driven arm by a leverage to drive the drive shank to rotate a socket so as to operate a workpiece in an energy-saving manner.

Abstract: In one embodiment, a torque-indicating driver includes a handle configured to receive applied torque. One or more flat springs are coupled via a housing to the handle at their proximate ends. The one or more flat springs are configured to angularly deflect elastically in response to the applied torque. A hub is coupled to a distal end of the one or more flat springs, the hub having a torsion rod extending therefrom. The torsion rod is configured to apply torque to a load. An outer sleeve at least partially covers the housing. One or more plungers are affixed to the housing and configured to engage one or more holes or depressions disposed at predetermined locations in the outer sleeve. Engagement with the holes or depressions creates auditory and tactile feedback perceivable by a user of the torque-indicating driver to indicate when a particular torque level is reached.

Abstract: A hand tool includes a tool shaft having a shank and a handle pivotally coupled together, and a tool head, which includes a socket defining a socket hole attachable to a locknut at a coaxial cable for fastening or loosening the locknut and a side opening for the passing of the locknut into or out of the socket hole, a driven structure located on an inner side of a receiving hole at one side of the socket hole, a transmission shaft coupled to the shank of the tool shaft and having a driving head located on one end thereof for engagement with the driven structure of the socket, and an elastic member stopped between the driving head and the socket such that when the socket reaches a predetermined torque value during operation, the driving head is moved axially away from the driven structure to compress the elastic member and to run idle.

Abstract: An adjustable torque limiting device includes a shank unit composed of first and second shanks coaxially and rotatably connected to each other, a carrier unit mounted between the shanks and having axially facing bearing regions and radially facing detent regions which cooperatively define cavities for receiving detent bodies, respectively, so as to transmit a straining force emanating from the detent regions to the detent bodies, a force transmitting member movably mounted on the shank unit and frictionally engaged with the detent bodies, an adjusting assembly turnable to axially move the force-counteracting member, and a compressible biasing member disposed between the force-counteracting member and the adjusting assembly to exert a preloaded force against the straining force.

Abstract: A wrench with a quick rotatable driving head includes a handle, a driving head and a quick-disengaging unit. The quick-disengaging unit is composed of a fixing member secured with the driving head, an operating member inserted through the handle and fitted around the fixing member, and a restraining element transversely provided between the fixing member and the operating member and the handle. The handle and the driving head can be separated by the quick-disengaging unit so that the driving head, with the quick-disengaging unit acting as a pivot, can quickly screw or unscrew a thread locking member, and the operating member can be restrictedly positioned on the fixing member by the restraining element, able to prevent the handle and the driving head from separating.

Abstract: The present invention relates to a handle, a head piece and a wrench, such as a torque wrench, in particular for use in surgery and prosthetics, such as surgery and prosthetics within the dental field. A handle for a wrench is provided, wherein the handle comprises an elongated body element extending along a first axis, and a torque arm for indicating the torque applied to the torque arm, the torque arm having a proximal end attached to the body element. Furthermore, the handle comprises a first locking element, the first locking element being adapted to removably engage with a locking element of a head piece, and the handle further comprises a ratchet element that is adapted to engage with a tool piece in a ratchet gear.

Abstract: An ultrasonic clamp coagulator system that is configured to permit selective cutting, coagulation and clamping of tissue during surgical procedures. An elongated portion of the instrument can be configured for endoscopic applications and has an outside diameter of less than 6 mm. The system includes a one-piece torque wrench that is provided with cantilever arms aligned in an annular fashion about the centerline of the torque wrench. The cantilever arms include teeth in an inward perpendicular fashion in relation to cantilever arms. The clamp coagulator includes an outer tube retainer that includes spline gears projecting in a perpendicular fashion along the outer circumference of retainer. Torque is transmitted through the cantilever arms to the spline gears for attaching a handpiece to the clamp coagulator.

Abstract: A torque wrench for implantable medical devices is disclosed. The torque wrench comprises a first and a second component. The first component has first and second ends with a bore extending between the first and second ends of the first component. The first component includes a plurality of anti-rotation members extending from an inner surface of the bore at the second end of the first component. A second component includes a middle portion having a first and second ends. A drive shaft extends from the first end and a plurality of fingers extends from an exterior surface of the second end. The second component is received in the bore of the first component such that the fingers are interdigitate with the anti-rotation members.

Abstract: A torque wrench having ease of operation compatible with improved accuracy of measurement. The torque wrench includes a tightening portion, a housing having a front side cover part and a back side grip part and a shaft-like strain body that is contained inside the housing. First distortion sensors and second distortion sensors are arranged on the strain body at spaced points in the axial direction of the strain body for measuring an amount of distortion of the strain body. A microprocessor chip has functions including computation of a tightening torque which is corrected for errors due to changes in a point of effort where a tightening force is applied by a user. The correction is based on the detection result of the first distortion sensors and the second distortion sensors. An output portion outputs the corrected tightening torque measurement value.

Abstract: A torque wrench for implantable medical devices is disclosed. The torque wrench comprises a first and a second component. The first component has first and second ends with a bore extending between the first and second ends of the first component. The first component includes a plurality of anti-rotation members extending from an inner surface of the bore at the second end of the first component. A second component includes a middle portion having a first and second ends. A drive shaft extends from the first end and a plurality of fingers extends from an exterior surface of the second end. The second component is received in the bore of the first component such that the fingers are interdigitate with the anti-rotation members.

Abstract: An impact resistant tool or tool bit holder has an active end for driving a fastener and a shanking end for securing to a power tool. The active end includes a body with a bore to receive the shank and a pocket to receive a damping mechanism. The shank includes an end to engage the bore in the body, and a pocket to receive the damping mechanism. The shank is received in the bore in the body for limited rotation with respect to the body. A damping mechanism is positioned in the pockets to provide damping between the body and the shank during torque loading.

Abstract: A double-fulcrum torque wrench including a tubular body, a head section for fitting with a socket or a screwing member and a flexible mechanism including a flexible section. The flexible mechanism is connected with a rear end of the head section and disposed in the tubular body. The head section protrudes from a front end of the tubular body. When a wrenching force is applied to the wrench, the flexible section of the flexible mechanism is flexible. The head section and the flexible mechanism are connected with the tubular body via two fulcrums and the flexible section is positioned between the two fulcrums. By means of the double-fulcrum design, the action force at the force application end of the wrench is equal to the action force at the resistance end. In addition, the flexure of the wrench and the actual wrenching torque applied to the wrench can be more accurately and sensitively measured.

Abstract: A torque wrench for implantable medical devices is disclosed. The torque wrench comprises a first and a second component. The first component has first and second ends with a bore extending between the first and second ends of the first component. The first component includes a plurality of anti-rotation members extending from an inner surface of the bore at the second end of the first component. A second component includes a middle portion having a first and second ends. A drive shaft extends from the first end and a plurality of fingers extends from an exterior surface of the second end. The second component is received in the bore of the first component such that the fingers are interdigitate with the anti-rotation members.

Abstract: A torque wrench for implantable medical devices is disclosed. The torque wrench comprises a first and a second component. The first component has first and second ends with a bore extending between the first and second ends of the first component. The first component includes a plurality of anti-rotation members extending from an inner surface of the bore at the second end of the first component. A second component includes a middle portion having a first and second ends. A drive shaft extends from the first end and a plurality of fingers extends from an exterior surface of the second end. The second component is received in the bore of the first component such that the fingers are interdigitate with the anti-rotation members.

Abstract: A torque wrench for implantable medical devices is disclosed. The torque wrench comprises a first and a second component. The first component has first and second ends with a bore extending between the first and second ends of the first component. The first component includes a plurality of anti-rotation members extending from an inner surface of the bore at the second end of the first component. A second component includes a middle portion having a first and second ends. A drive shaft extends from the first end and a plurality of fingers extends from an exterior surface of the second end. The second component is received in the bore of the first component such that the fingers are interdigitate with the anti-rotation members.

Abstract: A double-fulcrum torque wrench including a tubular body, a head section for fitting with a socket or a screwing member and a flexible mechanism including a flexible section. The flexible mechanism is connected with a rear end of the head section and disposed in the tubular body. The head section protrudes from a front end of the tubular body. When a wrenching force is applied to the wrench, the flexible section of the flexible mechanism is flexible. The head section and the flexible mechanism are connected with the tubular body via two fulcrums and the flexible section is positioned between the two fulcrums. By means of the double-fulcrum design, the action force at the force application end of the wrench is equal to the action force at the resistance end. In addition, the flexure of the wrench and the actual wrenching torque applied to the wrench can be more accurately and sensitively measured.

Abstract: Wrench (1) for providing a maximum torque to an external part, characterised in that it comprises at least one elongated metal part (3) provided with a fixed end (4) and a pusher end (5), and which also comprises a torque-applying head (6) upon which the pusher end (5) acts, wherein the elongated metal part (3) is capable of bending when a torque is applied with the wrench, and wherein the elongated metal part (3) reaches a maximum bending point that determines the maximum torque provided by the wrench (1). The inventive wrench (1) is easier to use than conventional spring-based wrenches as the force required to adjust the torque is minimal and independent of the torque value to which the wrench is adjusted. It is also capable of providing higher torque values.